Bobbin-case lock



N. E. LALIBERTE.

.BOBBIN CASE LOCK.

APPLICATION FILED AUG.!, 1918.

Patented Ap1i25, 1922.

INvENruY- ATM/5.-

' N TEI NAncIssE E. IJ ALIBERTIE'J, or HAvERiziILL, Assi cnUsETTsQ, AssIeiIon; Q M Q 1 SHOE MACHINERY COMPANY, ornevnmnnn, M ssAcn snm'rs, 'A'conronnrron '01 MASSACHUSETTS.

a citizen of "the Dominionof Canada, residing at Haverhill, county of Essex, State of Massachusetts, have invented acertain new and useful Improvement in Bobbin-Case Locks, of which the-following. is a specification, reference beinghad therein to the acv companyingdrawings. 1 i I Myinvention, relates to shoe sewing nachin'es of the type employinga loop-taker I and a thread-case thereinand has to do pariticiilarly with means for holding the J thread case in placewithin the loop-taker. As is Well understood by those skilled, in the are;

the bobbin case must beheld securely in I. place but in sucha manner thatit can be re- As is customary in sewing machines of this ite .th re i g'deseipaon when 'f e en in connection withlthe accompanying draw- A moved and replaced Whenever theithreadi s' exhausted. As it-{is'necessarjto frequently change h t f e wi li he era a e V is important tohave a thread case lockwh ch;

permits thefthrea'd. to be" replaced withi'a' minimum expenditure oftime and eifort.

The device embodying myinventionholds the"th read case positivelyjn place-at all times and the parts are L so constructed that 7 there f The invention will, be a y understood ings and the novel features thereof will be pointed out and clearly defined the claims- .at the close of this specification.

In the drawings, Fig.1 is a view in elevation' of my improved thread caseflock' applied to a sewing machine of thetype referred to. i i

Fig. 2 isa section on line 2 20f Fig. 1. i

Referringnow'to the drawings,at 11"; is

shown a shuttle race or housing within which is theioop-taker in the form of shuttle 12.; The shuttle '12 is operated by;

theshaft 13 and agearll in a manner not necessary togbe described in detaiL. Inside the shuttle 12 is the bobbin 'or thread case 15 which is shown containingfa bobbinv 16.

character, the frontface of the shuttle, that is, the faoe on the left hand side of Fig. 2 is open for the removal of the-bobbin case and i the bobbin case is provided at with a pr Specification of Letters Patent. Application filejd August.1, 15 18.:,.Seria1 110.247,?33.

: iiisnhoth'ing'to get t 'Q ordQfor to] Weaii", p p Q eosnm-cAsnnoom I Pate t ed Apr Q25; 1922 jection inwhich maybelocated the holei 19 through which the threadfrom thebobbia; v I

. I 5 At 20, 20 is showna' 'pairiof lugs on the is withdrawn. 1 1

front face, otthe shuttle housing-or support 11. At 21 is pivotedto these lugs aslightly) curved arm or bar 23 axially forkednatits,

lower (end as shown at 24. i The: fork is] so proportioned that it iwill'straddle" the proje'c tion'18 on'theendiojfthe bobbi il ase, andiWill thus keep'the bobbin case from rotating with f;

. fil ei h l 1 wo l otherw se b ts nd-f 'ency- By reas n of the susp nsiQn; :of-the retaining ar'm23from a pointnear itsupper x m tyyi fi a e ith ith s a m-t nd 3 .ll d the ti b gr rity, esnme sub;

st antially itsj normal position, as shown in es ne he pa t l el W kin P 5 sit on whlle atth'e same; time ave ing the ee e s y o th se. of .p itii esto sio 'ide termining th perative p sition .o flthe arm.

.When thearm 2351 in the posiition-showri shuttle housing; ,;{The latch 4; is provided whereby it may be. lifted out 'ofjsaid-space.

Thepperative portion ofthe latch A: con-j ['stitutes aspacing element or stop which en in full linesin Fi-gQQ, there isia 'space be j tween itsnpperIeDdQand .thegface aot-rthe shi ttle housing ,1 1; freelvmovablegrav 1 ity-actuated' latch ;is pivoted. at :25,; this 1 51 1 latchfbeing provided witha.portioiparranged V t d op ntoe .SPW bQtWQ I thG upperand 1 1 I ofnthe armj23-andjthe for-Ward. face of thef 1 "with a. suitable-. finger engaging; member T gagesthe arm 23';at,spacedpoints at opposite sides of, the pivot-pin 21 so as to "prevent the approach of eitherof these points toward the shuttle-race or support-{and therebyuprevent movement .ofg-the thread-- vcase-engaging outer portion ofthe arm 23 either toward or frpmthethread-case. The Y sides of the latch are. substantially parallel :and "its thickness is aboutthat of .the, space;

The latchextends down into the space to, a V

rpoint 'below the pivot 21 of thearm. When i i the latch is in place, thearm 23.1'cannot be' lifted up in the direction of its position shown in dotted lines in Fig. 2, ,bec ause the portion ofthearmdesignated a strikes the latch; neither can. it .be pushed in further QW d theb bin saee'beew e th ponies 'is positively locked in proper position.

of the arm designated 5 then strikes the latch. The arm is thus positively held against movement in either direction from the position which it normally assumes, as seen in Fig. 2, the useof a single locking eleinent simultaneously en aging the arm upon opposite sides of its pivotal axis, thus accomplishing in a very simpleand effective ease within the loop-taker, and means for retaining the bobbin case within the loopmanner theresults which heretofore havebeen attained only by the use of complicated and cumbersome devices. While it is within the scope of the invention to arrange a latch member for engagement with the front side'of arm 23, it is regarded as distinctly advantageous to locate any such locking device to the rear of said arm as herein shown, it being desirable in all cases to minimize the projection of parts fromthe forward face of the shuttle housing, wherever this is possible.

To remove the bobbin case, the latch is moved to the position shown in dotted lines in Fig. 1, andth'e arm 23lifted up.* To re store the parts to normal position, the opernow drops freelyinto substantially 'operative position automatically,"and by a single movement of the finger the latch 4 maybe thrown over" into position to drop; into" the space behind the arm'23, whereby the arm By the arrangement ofparts herein shown, thebobbi'n case is positively retained in proper position by the use of but two movable elements,-ea ch of which is of simple form and offeasy'construction and which can be manipulated by the operator'with little expenditure of time or attention Having thus describedthe invention'and a preferred embodiment of the same, what I claim and desire to secure by Letters Patent of the United States.is:'-' j 1. In combination, a loop-taker, a threadcase therefor, a support relative to which the loop-taker performs its operative movements, a pivotally mounted thread-case retaining member partially overlying said support, and a stop-member movable into and out of operative position between said retaining member and support.

2. In combination, a loop-taker, a thread case therefor, a support relative towhich the loop-taker performs its operative movements, a pivotally mounted thread-case retaining member partially overlying said support, and a stop member movable into and out of operative position between said retaining member and support and adapted to engage said member at spaced points at oppos1te-s1des-of its pivot. 7' In a sewing machine having a stationary support, in combination, a loop-taker,

movably' supportedby said support, a bobbin case within the loop-taker, a freely movable gravity-actuated member for retaining said ary support, in combination, a loop-taker rotatably supported in said housing, a bobbin taker comprising a bar'pivoted for movement substantially in a plane in which the axis of the loop-taker lies and engageable with said support, and a freely movable, gravityactuated latch member for retaining said bar in operativepositio'n.

5. In a sewing machine, in combination, a rotatable loop-taker, a bobbin case within said loop-taker, a bobbin case retaining arm pivotally mounted at one side of the bobbin case to swing toward and'from the plane of the latters face, and a latch c'onstructed. and

arrangedto move into and outofrengageinent with the retaining arm .uponthe opposit'e sideof its pivotal axis from that portion of said arm which engages the bobbin I case; v

y 6, A sewing machine having, in combination, abobbin-case, a retaining member for said bobbin caseswingable about a fixedpivot whereby to bring an element thereof into retaining engagement with said bobbin case,

- front to rear, a retaining arm for saidlbobbin 7 l0 5 case swingable about a fixedpivot substantially in a plane in which the axis of the shutter lies, "said arm havingnear' its free anda latch for said retaining'member movi "able'into and out engagement with that'side extremity an element arranged for operative contact with the bobbin case, and'a pivotally mounted latch member for said arm mounted to swing in plane at right angles to the axis ofthe bobbin case, and to the rear of said arm. n v v i i 8. In combination with a stationary shuttle housing, a rotating shuttle, a bobbin case inside the shuttle, a bobbin case retaining arm pivoted on a stationary part of the I machine, and a latch engaging a surface of the arm on opposite sides of the pivotal axis thereof so that the arm cannot be swung in either direction when the latch is in; place". 9. In combination with a shuttle housin and a latch adapted to move into the said space and to hold the arm in jacent the bobbin, case.

position ad- 10. In a sewing machine, in combination,

a shuttle housing, a shuttle rotatably supported therein, a bobbin case Within the shuttle, a pair of spaced lugs projecting outwardly from the upper portion of the shuttle housing, a bobbin-case retaining arm pivotally mounted between said lugs and depending therefrom, said arm provided nearv ing element, and a locking latch for said arm provided with a'ineinber constructed and 10 arranged to'be positioned between said arm in and theadjacent face of the shuttle housing. In testimony whereof I afiix my signature.

N ARCISSE E. LALIBERTE. 

